51 lines
2.0 KiB
JavaScript
51 lines
2.0 KiB
JavaScript
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import { Buffer } from 'buffer';
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import { KeyObject, createDecipheriv, createCipheriv, createSecretKey } from 'crypto';
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import { JOSENotSupported } from '../util/errors.js';
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import { concat } from '../lib/buffer_utils.js';
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import { isCryptoKey } from './webcrypto.js';
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import { checkEncCryptoKey } from '../lib/crypto_key.js';
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import isKeyObject from './is_key_object.js';
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import invalidKeyInput from '../lib/invalid_key_input.js';
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import supported from './ciphers.js';
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import { types } from './is_key_like.js';
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function checkKeySize(key, alg) {
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if (key.symmetricKeySize << 3 !== parseInt(alg.slice(1, 4), 10)) {
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throw new TypeError(`Invalid key size for alg: ${alg}`);
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}
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}
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function ensureKeyObject(key, alg, usage) {
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if (isKeyObject(key)) {
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return key;
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}
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if (key instanceof Uint8Array) {
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return createSecretKey(key);
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}
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if (isCryptoKey(key)) {
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checkEncCryptoKey(key, alg, usage);
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return KeyObject.from(key);
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}
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throw new TypeError(invalidKeyInput(key, ...types, 'Uint8Array'));
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}
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export const wrap = (alg, key, cek) => {
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const size = parseInt(alg.slice(1, 4), 10);
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const algorithm = `aes${size}-wrap`;
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if (!supported(algorithm)) {
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throw new JOSENotSupported(`alg ${alg} is not supported either by JOSE or your javascript runtime`);
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}
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const keyObject = ensureKeyObject(key, alg, 'wrapKey');
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checkKeySize(keyObject, alg);
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const cipher = createCipheriv(algorithm, keyObject, Buffer.alloc(8, 0xa6));
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return concat(cipher.update(cek), cipher.final());
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};
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export const unwrap = (alg, key, encryptedKey) => {
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const size = parseInt(alg.slice(1, 4), 10);
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const algorithm = `aes${size}-wrap`;
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if (!supported(algorithm)) {
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throw new JOSENotSupported(`alg ${alg} is not supported either by JOSE or your javascript runtime`);
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}
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const keyObject = ensureKeyObject(key, alg, 'unwrapKey');
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checkKeySize(keyObject, alg);
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const cipher = createDecipheriv(algorithm, keyObject, Buffer.alloc(8, 0xa6));
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return concat(cipher.update(encryptedKey), cipher.final());
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};
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